TestRestTemplate.getRootUri() returns empty string

[OrangeDog]

In Boot 3.5.8, @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT) would start a server and configure a TestRestTemplate from which you could get the URI to that server to e.g. test some non-Spring client code.

In Boot 4.0.0, adding @AutoConfigureTestRestTemplate to the same configures a TestRestTemplate, but getRootUri() always returns "". This isn't mentioned in the migration guide.

Should that be considered a bug, and/or is there another intended way to get the URI (in particular the port) for the test server?

[snicoll]

Thanks for the report, I confirm this to be a regression. In Spring Boot 4 the infrastructure to configure HTTP clients against the server started as part of a test is using LocalTestWebServer. You can obtain such instance using LocalTestWebServer.obtain(ApplicationContext).

you could get the URI to that server to e.g. test some non-Spring client code.

Is there more to it than the HTTP port? Why isn't LocalServerPort enough?

[OrangeDog]

I also noticed that most Location headers in test redirect responses are now relative URIs. Is that the same bug?

Why isn't LocalServerPort enough?

It should be, but the API I'm passing it to wants a full URI, so was simpler to not have to construct it myself.